Abstract: An electronic transformer system for powering gaseous discharge lamps includes an output transformer having a load connected to a secondary winding and having a power storage capacitor connected in series with a primary winding, a charging transistor connecting one end of the series combination to one polarity terminal of a voltage doubler DC power source, the other end of the series combination connected to the other polarity terminal of the power source, a discharging transistor connected across the series connected primary and capacitor, and an oscillator connected through a coupling transformer to the bases of the transistors. The oscillators alternately causes the transistors to switch into conduction to thereby alternately cause the charging and discharging of the capacitor through the output transformer. The charging and discharging characteristics of the capacitor result in the turn off of the transistors occurring at low current levels whereby turn off of the transistors is accelerated.

Abstract: A control system for heating and cooling devices is disclosed which increase the total running time for the heating and cooling devices as the ambient temperature sensed deviates from the set-point temperature. Five states of ON-time modulation of 2, 5, 10, 15 and 20 minutes are preferred in response to this deviation. Constant periods of OFF-time of 2 or 5 minutes occur after each period of ON-time. Within a small deviation of the ambient temperature around the set-point temperature no conditioning equipment is operated. Beyond a large deviation, the respective heating or cooling equipment is operated continuously. A manual override is disclosed, and the system is manually switched from a heating to a cooling mode. A fan control line switches on whenever a heating or cooling device is actuated and the control system can be used with a heat pump.